Why do we get sleepy and gassy on airplanes?
Blame it on the air pressure. At cruising altitude, our blood absorbs less oxygen, which can make us sleepy, dizzy, and mentally fuzzy. So, get up every hour and do a couple deep knee bends or lunges to boost the oxygen in your blood. And eat spinach, which has B‑vitamins that boost the supply of oxygen-rich red blood cells to your brain and muscles. And getting gassy on a plane is also due to reduced air pressure. It causes gas to expand in the body. So avoid carbonated beverages and high-fiber foods, which will increase that gas even more.